DEVICE FOR FILTERING SMOKE

Abstract

A device for filtering smoke, in particular tobacco and/or cannabis cigarette filters, comprising a jacket, in which jacket there are provided at least a first portion, a second portion and a third portion, the second portion being arranged between the first portion and the third portion, wherein in the first section a first nonwoven filter material, in the second section a porous filter material, and in the third section a second nonwoven filter material being provided in the third section; wherein a fourth section is provided in the jacket, wherein the third section is arranged between the second section and the fourth section, and wherein the fourth section is arranged such that, when flowing through the jacket, a pressure drop across the fourth section is lower than a pressure drop across the third section.

Claims

1. A device for filtering smoke, with a wrap formed by a filter wrap paper, wherein at least a first section, a second section and a third section are provided in the wrap, wherein the second section is disposed between the first section and the third section, wherein a first nonwoven filter material is provided in the first section; a porous filter material is provided in the second section; and a second nonwoven filter material is provided in the third section; wherein a fourth section is provided in the wrap, wherein the third section is disposed between the second section and the fourth section, and wherein the fourth section is configured in a manner such that a pressure drop over the fourth section is smaller than a pressure drop over the third section as a flow passes through the wrap, wherein the fourth section has a support element that supports the wrap in the region of the fourth section, wherein the porous filter material is activated carbon.

2. Device according to claim 1, wherein the fourth section has a cavity that extends from the end of the fourth section facing the third section to the end of the fourth section facing away from the third section.

3. (canceled)

4. Device according to claim 1, wherein the support element is in the form of a hollow cylinder.

5. Device according to claim 1, wherein the fourth section has a length in the longitudinal direction of the device of at least 2 mm.

6. Device according to claim 1, wherein an inner wrap is provided in the wrap that extends over the first section, the second section and the third section, wherein the first nonwoven filter material, the porous filter material and the second nonwoven filter material are disposed inside the inner wrap, wherein the first nonwoven filter material and the second nonwoven filter material are at least partially circumferentially bonded to the inner wrap.

7. Device according to claim 1, wherein the first section and the third section are disposed in a manner such that a pressure drop over the first section is greater than the pressure drop the third section as a flow passes through the wrap.

8. Device according to claim 7, wherein the pressure drop over the first section is at least 1.2 times the pressure drop over the third section.

9. Device according to claim 1, wherein the first section and the third section are disposed in a manner such that a pressure drop per unit length in the first section is greater than a pressure drop per unit length in the third section as a flow passes through the wrap.

10. Device according to claim 1, wherein the first nonwoven filter material has a greater density than the second nonwoven filter material.

11. Device according to claim 1, wherein the second section contains between 60 mg and 140 mg of the porous filter material.

12. Device according to claim 1, wherein the first nonwoven filter material contains cellulose acetate.

13. Device according to claim 1, wherein the second nonwoven filter material contains cellulose acetate.

14. (canceled)

15. A smoking article, comprising a substance that can be smoked, wherein the smoking article comprises a device according to claim 1, and wherein the first section of the device faces the substance that can be smoked.

16. Device according to claim 5, wherein the fourth section has a length in the longitudinal direction of the device of at least 4 mm.

17. Device according to claim 15, wherein the fourth section has a length in the longitudinal direction of the device of at least 6 mm.

18. Device according to claim 7, wherein the pressure drop over the first section is at least 1.5 times the pressure drop over the third section.

19. Device according to claim 7, wherein the pressure drop over the first section is at least 1.8 times the pressure drop over the third section.

20. Device according to claim 1, wherein the second section contains between 75 mg and 125 mg of the porous filter material.

21. Device according to claim 1, wherein the second section contains between 85 mg and 115 mg of the porous filter material.

22. Smoking article according to claim 14, wherein the smoking article is a tobacco cigarette, cannabis cigarette or tobacco-cannabis cigarette.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0032] The invention shall now be explained in detail below with the aid of a preferred exemplary embodiment as shown in the drawings, which are not limiting in any way.

[0033] FIG. 1 schematically shows a preferred embodiment of a device for filtering smoke in a sectional view.

[0034] FIG. 2 schematically shows the same embodiment of the device as FIG. 1, from the front.

[0035] FIG. 3 schematically shows a preferred embodiment of a smoking article in a sectional view.

DETAILED DESCRIPTION

[0036] FIG. 1 schematically shows a preferred embodiment of a device 1 for filtering smoke in a sectional view. FIG. 2 schematically shows the same embodiment from the front. The device 1 has a wrap 2. A first section 11, a second section 12, a third section 13 and a fourth section 14 are provided in the wrap 2. The second section 12 is disposed between the first section 11 and the third section 13. The third section 13 is disposed between the second section 12 and the fourth section 14. FIG. 2 shows the device 1 from a direction extending from the first section 11 to the fourth section 14. The wrap 2 bounds the first section 11, the second section 12, the third section 13 and the fourth section 14 in a radial direction 10. The radial direction 10 is indicated by a dashed arrow. The axial direction 11 (i.e. longitudinal direction) of the wrap 2 and the device 1 is orthogonal to the radial direction 10 and is also indicated by a dashed arrow.

[0037] A first nonwoven filter material 3 is provided in the first section 11. In particular, the first nonwoven filter material 3 is cellulose acetate. A porous filter material 4 is provided in the second section 12. In particular, the porous filter material 4 is activated carbon in granulated form. A second nonwoven filter material 5 is provided in the third section 13. In particular, the second nonwoven filter material 5 is cellulose acetate.

[0038] The fourth section 14 is disposed in a manner such that, during flow through the wrap 2 (in particular substantially in the axial direction 11), a pressure drop over the fourth section 14 is lower than a pressure drop over the third section 13. Thus, on the one hand, good filtration performance is obtained, but on the other hand, the passage through the device 1 is not made too difficult. Furthermore, cooling of smoke that is drawn through is obtained in the fourth section 14.

[0039] The fourth section 14 has a support element 9 that supports the wrap 2 in the region of the fourth section 14. The support element 9 is in the form of a hollow cylinder and extends along the entire length of the fourth section 14. The hole of the hollow cylinder forms a cavity 6 that extends from the end 7 of the fourth section 14 facing the third section 13 to the end 8 of the fourth section 14 facing away from the third section 13.

[0040] The first nonwoven filter material 3 and the second nonwoven filter material 5 are in fact shown with similar hatching. However, the second nonwoven filter material 3 has a lower density than the first nonwoven filter material 5. Thus, a pressure drop over the first section 11 is also greater than the pressure drop over the third section 13. Consequently, the first nonwoven filter material 3 can filter the smoke particularly well, whereas the second nonwoven filter material 5 is primarily intended to filter out the activated carbon dust and to remove as few flavor substances as possible from the smoke.

[0041] FIG. 3 schematically shows a preferred embodiment of a smoking article 20 in a sectional view. The smoking article 20 has, in a smoking article wrap 22, the device 1 for filtering smoke and a substance 21 that can be smoked. Here, the first section 11 of the device 1 is disposed facing the substance 21 that can be smoked, i.e. remote from the mouth, and the fourth section 14 of the device 1 is disposed facing away from the substance 21 that can be smoked, i.e. close to the mouth.